Special Services

ES-Consult has since its establishment completed several tasks related to important civil and structural works and has also carried out many special assignments in the category of applied sience. A very important part of the activities of the firm has been assistance and technical consultances to building- and infrastructure owners.
Here follows descriptions of a series of ES-Consult's special services.



Train-Bridge Interaction


The introduction of high speed trains in Denmark and Europe results in larger and more complicated loads than earlier. The problem increases with flexible and very long bridges.
High speed trains produce stronger vibrations in the bridge structure than slower trains do, and resonance vibrations may develop and affect the bridge. Special attention must be given to fatigue problems for the bridge structure caused by the vibrations.
ES-Consult has developed tools which describe the movements of both the bridge and the train during train passage. These tools can confirm or reject any conjectures concerning vibrations produced  by running trains.
ES-Consult has at its disposal a Finite Element programme, which enables us to determine the steel or concrete elements of a bridge that are exposed to exceptionally large loads. When the critical elements are known, the bridge design can subsequently be improved.
A special possibility for improving the response of a bridge against vibrations is the arrangement of vibration dampers such as mass dampers or hydraulic dampers.
Since train-bridge interaction is a complicated subject, it is essential for ES-Consult to communicate knowledge about,  and proposals for solving, these problems. ES-Consult has developed a well founded report concept, which above all focuses on the client's need for clear information about the problem.


ES-Consult has made a detailed analysis of the dynamic train load on the 8 km long Øresund bridge. The results of the analysis have been applied in the guidelines for the design of the bridge.
As a special topic ES-Consult analysed the riding comfort of the passengers in trains passing over the bridge. The purpose of the analysis was to achieve the highest possible comfort level.

Research and Development

ES-Consult has specialized in other vibration topics, and several of the staff members have many years of experience in solving vibration problems.
ES-Consult has itself developed a number of calculation tools for handling train-bridge interaction problems, and has published several papers in international journals.